Earthquake supercycles in Central Italy, inferred from 36Cl exposure dating

Details Earthquake supercycles in Central Italy, inferred from 36Cl exposure dating Earthquake supercycles in Central Italy, inferred from 36Cl exposure dating

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011e%26psl.307..487s&link_type=abstract

Earth and Planetary Science Letters, Volume 307, Issue 3-4, p. 487-500.

Physics

3

Scientific paper

We use 36Cl surface exposure dating to determine the slip release pattern over the last ~ 15 kyr for the Velino-Magnola fault, a major active normal fault in Central Italy. We sampled the fault at five well-separated sites along its length, and modeled the 36Cl concentrations measured in the 376 samples. We find that the fault broke in at least 9 large earthquakes that occurred in two 5-6 ka-long supercycles. Each cycle included a 4-5 ka-long phase of relative quiescence, followed by a cluster of at least 3 large earthquakes or earthquake sequences that released most of the accumulated strain in ~ 1 ka. All 9 identified events broke the entire fault and produced maximum surface slips of 2-3 m. Though the Velino-Magnola fault seems presently in a stage of relative quiescence, it may re-enter a phase of paroxysmal seismic activity in a few hundred of years.

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